Dosimetry device for charged particle radiation

a charge particle and dosimetry technology, applied in the field of dosimetry devices, can solve the problems of increasing the number of anode electrodes, increasing the number of substrates and the cost, and the resolution of the dose distribution cannot be increased, so as to increase the number of substrates and the cost, and increase the resolution of the dose distribution.

Active Publication Date: 2011-10-25
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]According to the invention, a low cost dosimetry device for charged particle radiation exclusive of such cables and connectors is provided.
[0010]In the dosimetry device for charged particle radiation according to the first aspect of the invention, a plurality of first electrodes are formed on one surface of the printed circuit board, a second electrode substrate having a second electrode is provided opposing to each of the first electrodes through an ionized space, and a signal processing circuit is provided on the other surface opposing to one surface of the printed circuit board. The signal processing circuit includes a plurality of integrating capacitors for integrating charge at each of the first electrodes, at least one amplifying circuit, and at least one selector switch that switchably connects each corresponding one of the integrating capacitors to the amplifying circuit. Therefore, it is not necessary to use special cables and connectors between the plurality of first electrodes and the signal processing circuit, and a low cost dosimetry device for charged particle radiation can be provided.
[0011]In the dosimetry device for charged particle radiation according to the second aspect of the invention, a multi-layer printed circuit board has a plurality of wiring layers opposing to one another, a plurality of first electrodes are formed on one surface of one of the wiring layers positioned on one surface of the multi-layer printed circuit board among the plurality of wiring layers, a second electrode substrate having a second electrode is provided opposing to each of the first electrodes through an ionized space, and a signal processing circuit is provided on at least another one of the wiring layers of the multi-layer printed circuit board. The signal processing circuit includes a plurality of integrating capacitors for integrating charge at each of the first electrodes, at least one amplifying circuit, and at least one selector switch that switchably connects each corresponding one of the integrating capacitors to the amplifying circuit. Therefore, it is not necessary to use special cables and connectors between the plurality of first electrodes and the signal processing circuit, and a low cost dosimetry device for charged particle radiation can be provided.

Problems solved by technology

Therefore, the frame having the anode electrodes and the substrate having the signal processing circuit thereon must be connected by cables and connectors, and in consideration of the connector size and a practical number of cables required, the number of anode electrodes cannot be increased, in other words, the resolution of the dose distribution cannot be increased.
The substrate on which the frame having the anode electrodes is provided and the substrate having the signal processing circuit thereon are necessary in total, which increases the number of substrates and the cost.

Method used

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  • Dosimetry device for charged particle radiation
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  • Dosimetry device for charged particle radiation

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first embodiment

[0030]FIG. 1 is a view of a dosimetry device for charged particle radiation according to a first embodiment of the invention, FIG. 2 is a backside view of a printed circuit board according to the first embodiment, and FIG. 3 is an electrical circuit diagram of one signal processing block in a signal processing circuit according to the first embodiment.

[0031]With reference to FIG. 1, a single printed circuit board (PCB) 10 is used for the dosimetry device for charged particle radiation according to the first embodiment. The printed circuit board 10 has a pair of main surfaces S1 and S2 opposing to each other. The main surface S1 is for example a front surface of the printed circuit board 10, and the main surface S2 is the backside surface thereof. The printed circuit board 10 is a double-sided printed circuit board, and circuit elements are formed both on the main surfaces S1 and S2.

[0032]An ionization unit 20 is provided on the main surface S1 of the printed circuit board 10, and a ...

second embodiment

[0045]According to the first embodiment, the plurality of integrating capacitors 43 connected to the plurality of first electrodes 21 are provided in the second parts S2A2 unaffected by charged particle radiation in the central region S2A of the main surface S2. According to the second embodiment, the plurality of integrating capacitors 43 are ceramic capacitors 43a which are provided in the first part S2A1 of the central region S2A, in other words, at the backside surfaces of the first electrodes 21. The first part S2A1 has the plurality of first electrodes 21 therein, and the ceramic capacitors 43a are subjected to charged particle radiation. However, the ceramic capacitors 43a having high resistance against charged particle radiation can integrate and hold charge at the first electrodes 21 without the effect of the charged particle radiation though they are provided at the backside surfaces of the first electrodes 21.

[0046]FIG. 4 is a view showing the arrangement of one signal pr...

third embodiment

[0048]According to a third embodiment, the printed circuit board 10 according to the first embodiment is replaced by a multi-layer printed circuit board MPCB. The multi-layer printed circuit board MPCB includes number n of wiring layers 51, 52, 53, 54, . . . , 5(n −1), and 5n opposing and parallel to one another. A wiring layer positioned on the main surface S1 of the multi-layer printed circuit board MPCB is referred to as “first wiring layer 51” and a wiring layer positioned on the main surface S2 is referred to as “n-th wiring layer 5n.” A plurality of intermediate wiring layers other than the first and n-th wiring layers 51 and 5n are referred to as second wiring layer 52, third wiring layer 53, fourth wiring layer 54, . . . , and (n−1)-th wiring layer 5(n−1) sequentially from the first wiring layer 51 to the n-th wiring layer 5n.

[0049]An ionization unit 20 is provided on the main surface S1 of the multi-layer printed circuit board MPCB similarly to the first embodiment. More s...

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Abstract

A dosimetry device for charged particle radiation that can be exclusive of cables and connectors between substrates is provided. A plurality of first electrodes are formed on one surface of a printed circuit board, a second electrode substrate having a second electrode opposing each of the plurality of first electrodes through an ionized space is provided, and a signal processing circuit is provided on the other surface opposing the surface of the printed circuit board. The signal processing circuit includes at least one amplifying circuit, a plurality of integrating capacitors corresponding to the amplifying circuit for integrating charge at each corresponding one of the first electrodes, and at least one selector switch that switchably connects each of the integrating capacitors to the amplifying circuit. The printed circuit board may be a multi-layer printed circuit board.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a dosimetry device used to measure the dose distribution of charged particle radiation.[0003]2. Description of the Related Art[0004]A conventional dosimetry device for charged particle radiation is disclosed for example in “A pixel chamber to monitor the beam performances in hadrontherapy,”Nuclear Instruments and Methods in Physics Research, A519, pp. 674 to 686, 2004.[0005]The dosimetry device for charged particle radiation disclosed by the publication includes a high voltage electrode (cathode electrode), an ionization chamber including a spacing frame and a frame having a plurality of anode electrodes arranged in a matrix, and a signal processing circuit that processes a signal from each of the anode electrodes. An ionized space forms between the high voltage electrode (cathode electrode) and each of the anode electrodes, and high voltage is applied between the high voltage electrode ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01J47/02
CPCG01T1/02A61N5/1075A61N2005/1087
Inventor YAMAMOTO, YUICHI
Owner MITSUBISHI ELECTRIC CORP
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